Installation and equipment for liquefied natural gas - Design and testing of marine transfer systems - Part 2: Design and testing of transfer hoses

This European Standard gives general guidelines for the design, material selection, qualification, certification, and testing details for Liquefied Natural Gas (LNG) transfer hoses for offshore transfer or on coastal weather-exposed facilities for aerial, floating and submerged configurations or a combination of these. Whilst this European Standard is applicable to all LNG hoses, it is acknowledged that there may be further specific requirements for floating and submerged hoses.
The transfer hoses will be designed to be part of transfer systems (it means that they will be fitted with ERS, QCDC, handling systems, hydraulic and electric components etc.) To avoid unnecessary repetition, cross-references to EN 1474-1 and EN 1474-3, are made for all compatible items, and for references, definitions and abbreviations. Where additional references, definitions and abbreviations are required specifically for LNG hoses, they are listed in this European Standard.
Transfer hoses need to be durable when operating in the marine environment and to be flexible with a minimum bending radius compatible with handling and the operating requirements of the transfer system.

Anlagen und Ausrüstung für Flüssigerdgas - Auslegung und Prüfung von Schiffsübergabesystemen - Teil 2: Auslegung und Prüfung von Übergabeschläuchen

Dieses Dokument gibt generelle Leitlinien für die Auslegung, Werkstoffauswahl, Eignung, Zertifizierung und Prüfdetails für Schlauchleitungen für Flüssigerdgas (LNG, en: liquified natural gas) für die Übergabe auf See.
Die Übergabeschlauchleitungen werden als Teil eines Übergabesystems ausgelegt (d. h., sie können mit ERS [en: emergency release system], QCDC [en: quick connect disconnect coupler], Handhabungssystemen, hydraulischen und elektrischen Bauteilen usw. ausgerüstet sein). Zur Vermeidung von unnötigen Wiederholungen wird für alle vergleichbaren Gegenstände, für Definitionen und Abkürzungen auf EN ISO 16904 und EN 1474 3 verwiesen. Sofern zusätzliche Verweise, Definitionen und Abkürzungen für LNG-Schlauchleitungen benötigt werden, sind sie in dieser Europäischen Norm aufgeführt.

Installations et équipements de gaz naturel liquéfié - Conception et essais des systèmes de transfert marins - Partie 2: Conception et essais des tuyaux de transfert

Le présent document fournit des lignes directrices générales relatives à la conception, au choix des matériaux, à la qualification, à la certification et aux détails des essais concernant les flexibles destinés aux applications de transfert marin de gaz naturel liquéfié (GNL).
Les flexibles de transfert font partie intégrante des systèmes de transfert (ce qui signifie qu’ils peuvent être équipés d’ERS, de QCDC, de systèmes de manutention, de composants hydrauliques et électriques, etc.). Afin d’éviter toute répétition inutile, les références à l’EN ISO 16904 et à l’EN 1474-3 sont valables pour tous les éléments compatibles, ainsi que pour les références, définitions et abréviations. Si des références, des définitions et des abréviations supplémentaires sont spécifiquement nécessaires pour les tuyaux flexibles de GNL, elles sont énumérées dans la présente Norme européenne.

Napeljave in oprema za utekočinjeni zemeljski plin - Načrtovanje in preskušanje obalnih pretakališč - 2. del: Načrtovanje in preskušanje cevi za pretakanje

Ta evropski standard določa splošne smernice za načrtovanje, izbiro materialov, kvalifikacijo, certificiranje in podrobnosti o preskušanju cevi za pretakanje utekočinjenega zemeljskega plina (LNG) za pretakanje po morju ali na obalnih vremensko izpostavljenih objektih za zračne, plavajoče ali potopljene konfiguracije oziroma njihovo kombinacijo. Čeprav se ta evropski standard uporablja za vse cevi za pretakanje utekočinjenega zemeljskega plina, lahko za plavajoče in potopljene cevi veljajo dodatne posebne zahteve.
Cevi za pretakanje bodo zasnovane kot del pretočnih sistemov (kar pomeni, da bodo opremljene z električnimi rotacijskimi stroji (ERS), hidravlično upravljanimi hitrimi spojkami (QCDS), sistemi za upravljanje, hidravličnimi in električnimi komponentami itd.). V izogib nepotrebnemu ponavljanju so navedena navzkrižna sklicevanja na standard EN 1474-1 in EN 1474-3 za vse združljive elemente in za reference, definicije in okrajšave. Če se za cevi za utekočinjeni zemeljski plin zahteva dodatne reference, definicije in okrajšave, so te navedene v tem evropskem standardu.
Cevi za pretakanje morajo biti trpežne, če so nameščene v morskem okolju in prilagodljive z najmanjšim polmerom upogibanja, ki izpolnjuje zahteve za upravljanje in delovanje pretočnega sistema.

General Information

Status
Published
Public Enquiry End Date
03-Aug-2019
Publication Date
01-Nov-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Oct-2020
Due Date
02-Jan-2021
Completion Date
02-Nov-2020

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SLOVENSKI STANDARD
SIST EN 1474-2:2020
01-december-2020
Nadomešča:
SIST EN 1474-2:2009
Napeljave in oprema za utekočinjeni zemeljski plin - Načrtovanje in preskušanje
obalnih pretakališč - 2. del: Načrtovanje in preskušanje cevi za pretakanje
Installation and equipment for liquefied natural gas - Design and testing of marine
transfer systems - Part 2: Design and testing of transfer hoses
Anlagen und Ausrüstung für Flüssigerdgas - Auslegung und Prüfung von
Schiffsübergabesystemen - Teil 2: Auslegung und Prüfung von Übergabeschläuchen
Installations et équipements de gaz naturel liquéfié - Conception et essais des systèmes
de transfert marins - Partie 2: Conception et essais des tuyaux de transfert
Ta slovenski standard je istoveten z: EN 1474-2:2020
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
SIST EN 1474-2:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1474-2:2020

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SIST EN 1474-2:2020


EN 1474-2
EUROPEAN STANDARD

NORME EUROPÉENNE

September 2020
EUROPÄISCHE NORM
ICS 75.200 Supersedes EN 1474-2:2008
English Version

Installation and equipment for liquefied natural gas -
Design and testing of marine transfer systems - Part 2:
Design and testing of transfer hoses
Installations et équipements de gaz naturel liquéfié - Anlagen und Ausrüstung für Flüssigerdgas - Auslegung
Conception et essais des systèmes de transfert marins - und Prüfung von Schiffsübergabesystemen - Teil 2:
Partie 2 : Conception et essais des flexibles de transfert Auslegung und Prüfung von Übergabeschläuchen
This European Standard was approved by CEN on 19 July 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1474-2:2020 E
worldwide for CEN national Members.

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviations . 5
3.1 Terms and Definitions . 5
3.2 Abbreviations . 10
4 Applications and Qualification Categories . 10
4.1 Applications . 10
4.2 Qualification Categories . 10
5 Description of typical LNG transfer hose assembly designs and accessories . 11
5.1 General . 11
5.2 Mandatory components . 11
5.3 Optional components . 12
5.4 Typical construction of LNG transfer hose assemblies . 12
5.4.1 Main hose categories . 12
5.4.2 Corrugated metal hose assemblies . 13
5.4.3 Thermoplastic multi-layer (non-vulcanized) hose assemblies (Composite hose
assemblies) . 15
5.4.4 Hose-in-hose with annular space . 16
6 Design features of the LNG transfer hoses assemblies . 17
6.1 General . 17
6.2 Transfer Hose Assembly technology design parameters . 17
6.3 Project Specific Design Parameters . 18
6.3.1 Selection of hose assembly length . 18
6.3.2 Service life . 18
6.3.3 Selection of buoyancy and submersion . 18
6.3.4 Selection of insulation . 18
6.3.5 Selection of external protection . 19
6.3.6 Selection of leak detection . 19
6.4 Component details – End fitting . 19
6.4.1 General . 19
6.4.2 Termination . 20
6.4.3 Connector . 20
6.4.4 Bending stiffener/restrictor (optional) . 20
6.5 Hose assembly handling / lifting device . 20
6.6 Safety systems . 20
6.6.1 Leak detection (optional) . 20
6.6.2 Fire safety requirements . 21
6.6.3 Electrical safety requirements . 21
6.7 Connection to the ship . 21
6.8 Hydraulic and electric control systems . 21
7 Qualification Requirements . 21
7.1 Foreword . 21
7.2 Qualification process . 22
7.2.1 General Principle . 22
2

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
7.2.2 Qualification Levels Specific Requirements . 22
7.2.3 Certification range definition from a tested hose assembly . 24
7.2.4 Certification extension and update . 25
7.3 Hose Assembly tests . 25
7.3.1 General . 25
7.3.2 Hose assembly property characterization tests . 26
7.3.3 Qualification tests with acceptance criteria . 34
8 Quality assurance and control . 44
8.1 General . 44
8.2 Material selection . 44
8.3 Manufacturing. 45
8.3.1 Manufacturing basics . 45
8.3.2 Traceability . 45
8.3.3 Marking . 45
8.3.4 Packing and Preservation . 46
8.4 Factory acceptance tests . 46
8.4.1 General . 46
8.4.2 Tests to be performed on every hose assembly . 46
9 Documentation . 46
9.1 Purchasing Guidelines . 46
9.2 Design, Qualification and Manufacturing Documentation . 46
9.3 As-built documentation/Manufacturing Data Book . 47
9.4 Operation manual . 47
Annex A (informative) Purchasing guidelines table . 49
Annex B (informative) Guidelines for additional testing program . 52
Annex C (Informative) Guidelines for Hose Qualification Categories (HQCs) Selection . 59
Annex D (informative) Surge pressure considerations for LNG hose assemblies . 61
Annex E (Informative) Pressure Leak Tests - justification about maximum allowed permeability
rate and leak detection value . 62
Bibliography . 64
3

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
European foreword
This document (EN 1474-2:2020) has been prepared by Technical Committee CEN/TC 282 “Installation and
equipment for LNG”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2020, and conflicting national standards shall be withdrawn at
the latest by March 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1474-2:2008.
In comparison with the previous edition, the following technical modifications have been made:
— Update of the scope
— Review of Application and introduction of Hose Qualification Categories
— Revision of hose assembly categories
— Review of design features
— Review of qualification requirements
— Review of Quality assurance and control
— Review of documentation
— Review of annexes
This series consists of 3 parts:
— EN 1474-1: Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 1: Design and testing of transfer arms
(This standard has been superseded by EN ISO 16904 - Petroleum and natural gas industries - Design and
testing of LNG marine transfer arms for conventional onshore terminals)
— EN 1474-2: Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 2: Design and testing of transfer hoses
— EN 1474-3, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 3: Offshore transfer systems
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia,
Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
4

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
1 Scope
This document gives general guidelines for the design, material selection, qualification, certification, and
testing details of hose assemblies for Liquefied Natural Gas (LNG) marine transfer applications.
The transfer hose assemblies are part of transfer systems (it means that they may be fitted with ERS, QCDC,
handling systems, hydraulic and electric components etc.) To avoid unnecessary repetition, cross-references
to EN ISO 16904 and EN 1474-3 are made for all compatible items, and for references, definitions and
abbreviations. Where additional references, definitions and abbreviations are required specifically for LNG
hose assemblies, they are listed in this European Standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 1474-1:2008, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 1: Design and testing of transfer arms
EN 1474-3:2008, Installation and equipment for liquefied natural gas - Design and testing of marine transfer
systems - Part 3: Offshore transfer systems
EN ISO 7369:2004, Pipework - Metal hoses and hose assemblies - Vocabulary (ISO 7369:2004)
EN ISO 8330:2014, Rubber and plastics hoses and hose assemblies - Vocabulary (ISO 8330:2014)
EN ISO 10012:2003, Measurement management systems - Requirements for measurement processes and
measuring equipment (ISO 10012:2003)
EN ISO 10619-1:2018, Rubber and plastics hoses and tubing - Measurement of flexibility and stiffness - Part 1:
Bending tests at ambient temperature (ISO 10619-1:2017)
EN ISO 16904:2016, Petroleum and natural gas industries - Design and testing of LNG marine transfer arms for
conventional onshore terminals (ISO 16904:2016)
3 Terms, definitions and abbreviations
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions given in EN ISO 7369:2004 and
EN ISO 8330:2014 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
annular space
space between the inner fluid carrying layer and a second layer which can be used for insulation and/or safety
purposes
5

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
3.1.2
armour layer
either a braid made of wires (see braid) or strips of metal or plastic used to provide pressure strength and/or
external protection
3.1.3
axial stiffness
extent to which a hose assembly resists tensile deformation in response to an applied axial force
3.1.4
bend stiffness
ability of a flexible pipe to resist deflection when subjected to bending loads at constant tension, pressure and
temperature
3.1.5
bend restrictor
device for limiting the bend radius by mechanical means
NOTE 1 to entry: A bend restrictor typically comprises a series of interlocking metallic or moulded rings, applied over
the outer surface
3.1.6
bending stiffener
ancillary conical shaped component, which locally supports the pipe to limit bending stresses and curvature
of the pipe to acceptance levels
NOTE 1 to entry: Bend stiffeners may be either attached to an end fitting or a support structure where the flexible pipe
passes through the bend stiffener
3.1.7
boil-off gas
BOG
natural evaporation from liquefied natural gas due to vaporization
3.1.8
burst test
test conducted on a hose sample until it failed by internal pressurization
3.1.9
buoyancy
degree, to which the hose assembly has buoyancy capabilities calculated according to 7.3.2.6
3.1.10
connector
part of the end fitting used to provide a leak-tight structural connection between the end fitting and adjacent
piping
3.1.11
crush test
application of a vertical load through a beam placed laterally across the hose assembly
6

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
3.1.12
double-envelope
layer or set of layers effecting the enclosure, and thus the isolation from the environment, of those structures,
systems and components whose failure can lead to an unacceptable release of LNG
3.1.13
dynamic load
loads to flexible hose assembly or hose assembly configuration which vary in time, or whose deflections or
boundary conditions vary in time, while hose is connected
3.1.14
emergency release system
ERS
system that provides a positive means of quick release of transfer system and safe isolation of LNG carrier and
transfer system
NOTE 1 to entry: The ERS consists of an emergency release coupling (ERC) and interlocked isolating valves which
automatically close on both sides, thereby containing the LNG or vapour in the lines (dry disconnect), and, if applicable,
associated control system
3.1.15
end termination
mechanical device which forms the transition between the flexible pipe body and the connector whose
different pipe layers are terminated in the end fitting in such a way as to transfer the load between the flexible
hose assembly and the connector
3.1.16
end fitting
assembly of connector and end termination
3.1.17
emergency release coupler
ERC
device to provide a means of quick release of the transfer system when such actions is required only as an
emergency measure
3.1.18
fatigue life
number of cycles of a specified character that a given specimen sustains before failure of a specified nature
occurs
3.1.19
hose assembly
hose and its fittings
3.1.20
impact test
test for determining the impact strength of a material
3.1.21
leak detection system
system able to detect a failure / leak from the fluid carrying part of the hose assembly
7

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
3.1.22
liquefied natural gas
LNG
natural gas that has been cooled and condensed into liquid form
3.1.23
maximum allowable impact energy
MAIE
maximum impact energy which can be applied to the hose assembly without bringing permanent damage to
the hose assembly structure and performances
3.1.24
maximum allowable crush load
MACL
maximum allowable crush load which can be applied to the hose assembly without bringing permanent
damage to the hose assembly structure and performances
3.1.25
maximum allowable working pressure
MAWP
maximum pressure (gauge) across the entire specified temperature range to which the hose may be exposed
and operated
Note 1 to entry: It is commonly used by terminals to define their cargo system pressure capabilities (i.e. pump shut-in
plus any static head or cargo system safety valve relief setting.
Note 2 to entry: This pressure rating is not expected to account for dynamic surge pressures, but does include nominal
pressure variations during cargo transfer operations)
3.1.26
maximum working load
MWL
maximum allowable tensile force of the hose assembly in axial direction, applied to the end-fittings
3.1.27
minimum Bend Radius
MBR
minimum radius at which the hose assembly is designed to operate
3.1.28
non-destructive test
ND
test that is not expected to cause permanent damage to the hose assembly, so that the hose assembly can be
used in subsequent tests and for operation as well
3.1.29
owner
business entity who has the legal or rightful title to the asset intended for LNG transfer
8

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
3.1.30
proof pressure
pressure to which the hose assembly is tested (i.e. during a Factory Acceptance Test) to demonstrate its
structural integrity when subject to internal pressure
NOTE 1 to entry: According to the IMO IGC Code this pressure test at ambient temperature shall be not less than 1,5 x
MAWP and not more than two-fifths of its burst pressure
3.1.31
pumping port
connection to attach a vacuum pump for vacuum insulated hose assemblies
3.1.32
quick connect disconnect coupler
QCDC
manual or hydraulic mechanical device used to connect a transfer arm or hose to the cargo manifold without
employing bolts
3.1.33
service life
period of time during which the hose assembly fulfils all performance requirements for the specified or less
severe condition in the same Hose Qualification Category
3.1.34
static load
flexible hose assemblies not exposed to significant cyclically varying loads or deflections during normal
operations
3.1.35
storage bend radius
minimum radius at which the hose assembly is designed to be stored or handled. SBR may be lower than MBR
3.1.36
super-insulation
several high reflecting foils to reduce heat transfer via radiation as part of a vacuum insulation system
3.1.37
type approval certificate
certificate issued by an IVA confirming the suitability and appropriate limits on the manufacturer's design
methodologies, manufacturing processes and materials
Note 1 to entry: The name of this certificate can differ according to the IVA
3.1.38
visual inspection
examination of parts and equipment for visible defects in material and workmanship
9

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
3.2 Abbreviations
D internal bore diameter of the hose assembly
FAT factory acceptance test
FSRU floating Storage Regasification Unit
HQC hose qualification category
IVA Independent verification agency
L Length of flexible part of the hose assembly
LNGC liquefied natural gas carrier
MAAT Maximum allowable applied twist

4 Applications and Qualification Categories
4.1 Applications
This subclause describes the main application using LNG transfer hose assemblies.
As industry and technology is developing, other type of application may consider using LNG transfer hose
assemblies and shall be covered in this standard.
List of applications (not exhaustive):
— Offshore tandem FLNG offloading / loading aerial or floating;
— Ship-To-Ship transfer such as LNGC to FSRU, LNG Bunkering;
— Shore-To-Ship such as LNG bunkering;
— Ship-To-Shore such as offloading / loading.
Based on the application and use of the hose assembly, there are different categories of hose assembly
qualification required. Main difference are the dynamic loads on the hose assembly. The following subclause
introduces Hose assembly Qualification Categories (HQC).
NOTE Guidelines for the owners regarding applications and relevant HQC are available in Annex C. Selection of HQC
remains the owner’s responsibility.
4.2 Qualification Categories
This subclause establishes criteria for definition of Hose Qualification Categories for the hose assemblies
covered by this standard. The Hose Qualification Categories specified below define different design
verification requirements as per subclause 7.2.2.
The test scope within all Qualification Categories define the basis for the hose assemblies qualification but are
independent of each project specific data (metocean data, waves & current data,). During the design for a
project the required HQC should be checked by the owner and / or IVA.
The owner / IVA can require executing additional tests in order to determine if the proposed hose assembly
is “Fit for Purpose” (For fatigue test for example, specific attention should be paid on bending loads adjacent
to end terminations)
— Hose Qualification Category A
10

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SIST EN 1474-2:2020
EN 1474-2:2020 (E)
This HQC is intended to be used for quasi-static applications (i.e. application only driven by handling
and/or thermal and pressure fatigue).
This category is including the performance requirements applicable to all aerial transfer hose assembly,
typically transfer hose assemblies used in protected environment for intermittent usage without contact
with water and with negligible dynamic motions.
— Hose Qualification Category B
This HQC is intended to be used for dynamic applications driven by aerial transfer fatigue including
significant tensile and bending fatigue loads (e.g. by vessel motions or wind loads).
This Category is including the performance requirements applicable to all aerial transfer hose assemblies
and typically applicable for the hose assemblies used in combinatio
...

SLOVENSKI STANDARD
oSIST prEN 1474-2:2019
01-julij-2019
Napeljave in oprema za utekočinjeni zemeljski plin - Načrtovanje in preskušanje
obalnih pretakališč - 2. del: Načrtovanje in preskušanje cevi za pretakanje
Installation and equipment for liquefied natural gas - Design and testing of marine
transfer systems - Part 2: Design and testing of transfer hoses
Anlagen und Ausrüstung für Flüssigerdgas - Auslegung und Prüfung von
Schiffsübergabesystemen - Teil 2: Auslegung und Prüfung von Übergabeschläuchen
Installations et équipements de gaz naturel liquéfié - Conception et essais des systèmes
de transfert marins - Partie 2: Conception et essais des tuyaux de transfert
Ta slovenski standard je istoveten z: prEN 1474-2
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
oSIST prEN 1474-2:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 1474-2:2019

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oSIST prEN 1474-2:2019


DRAFT
EUROPEAN STANDARD
prEN 1474-2
NORME EUROPÉENNE

EUROPÄISCHE NORM

July 2019
ICS 75.200 Will supersede EN 1474-2:2008
English Version

Installation and equipment for liquefied natural gas -
Design and testing of marine transfer systems - Part 2:
Design and testing of transfer hoses
Installations et équipements de gaz naturel liquéfié - Anlagen und AusrÃ1/4stung fÃ1/4r FlÃ1/4ssigerdgas
Conception et essais des systèmes de transfert marins - - Auslegung und PrÃ1/4fung von
Partie 2: Conception et essais des tuyaux de transfert SchiffsÃ1/4bergabesystemen - Teil 2: Auslegung und
PrÃ1/4fung von ÿbergabeschläuchen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 282.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

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Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1474-2:2019 E
worldwide for CEN national Members.

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Contents Page
European foreword . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 Terms and Definitions . 7
3.2 Abbreviations . 11
4 Applications and Qualification Categories . 11
4.1 Applications . 11
4.2 Qualification Categories . 11
5 Description of typical LNG transfer hose assembly designs and accessories . 12
5.1 General . 12
5.2 Mandatory components . 12
5.3 Optional components . 13
5.4 Typical construction of LNG transfer hose assemblies . 13
5.4.1 Main hose categories . 13
5.4.2 Corrugated metal hose assemblies . 14
Figure 1 — Typical hose assembly – reinforced corrugated metal hose family . 15
Figure 2 — Typical hose assembly – Sketch of a LNG flexible hose with vacuum insulation option16
5.4.3 Thermoplastic multi-layer (non-vulcanized) hose assemblies (Composite hose
assemblies) . 16
Figure 3 — Typical hose – composite hose family . 17
5.4.4 Hose-in-hose with annular space . 17
6 Design features of the LNG transfer hoses assemblies . 18
6.1 General . 18
6.2 Transfer Hose Assembly technology design parameters . 18
6.3 Project Specific Design Parameters . 19
6.3.1 Selection of hose length . 19
6.3.2 Service life . 19
6.3.3 Selection of buoyancy and submersion . 19
6.3.4 Selection of insulation . 19
6.3.5 Selection of external protection . 19
6.3.6 Selection of leak detection . 20
6.4 Component details – End fitting . 20
6.4.1 General . 20
Figure 4 — Typical end fitting assembly – composite hose family . 20
6.4.2 Termination . 21
6.4.3 Connector . 21
6.4.4 Bending stiffener/restrictor (optional) . 21
6.5 Hose handling / lifting device . 21
6.6 Safety systems . 21
6.6.1 Leak detection (optional) . 21
6.6.2 Fire safety requirements . 22
6.6.3 Electrical safety requirements . 22
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6.7 Connection to the ship . 22
6.8 Hydraulic and electric control systems . 22
7 Qualification Requirements . 22
7.1 Foreword . 22
7.2 Qualification process . 23
7.2.1 General Principle . 23
7.2.2 Qualification Levels Specific Requirements . 23
Table 1 — Tests for Hose Qualification Categories . 23
7.2.3 Certification range definition from a tested hose assembly . 24
7.2.4 Certification extension and update . 25
7.3 Hose Assembly tests . 25
7.3.1 General . 25
7.3.1.1 Safety considerations . 25
7.3.1.2 Test liquids . 26
7.3.1.3 Pressure and temperature requirements . 26
7.3.1.4 Requirements for measurement equipment accuracy . 26
7.3.2 Hose property characterization tests . 27
7.3.2.1 Tensile stiffness . 27
Table 2 tensile Stiffness test laod conditions . 27
Table 3 Boundary conditions for the axial tests . 28
Figure 5 — Principle of the axial tension and torsion test set up . 28
7.3.2.2 Torsion stiffness . 28
Table 4 — Torsion stiffness test load conditions . 29
Table 5 Boundary conditions for the torsion tests . 29
7.3.2.3 Bending stiffness . 29
Table 6 — Bending stiffness test load conditions . 29
Figure 6 — Principle of the bending stiffness test set up . 30
Table 7 — Boundary conditions for the bending tests . 31
7.3.2.4 Hose damping . 31
Table 8 — Hose damping test load conditions . 31
Figure 7 — Two possible principles of the hose damping test set up . 32
7.3.2.5 Insulation test . 32
Table 9 — Insulation test load conditions . 32
Figure 8 — Principle of the insulation test set up . 33
7.3.2.6 Buoyancy / Submerged Weight . 33
7.3.2.7 Collapse Resistance . 34
7.3.3 Qualification tests with acceptance criteria . 34
7.3.3.1 Pressure leak test . 34
Table 9 — Pressure leak test load conditions . 34
Table 10 Boundary conditions for the ambient and cryogenic pressure tests . 35
Figure 9 — Principle of ambient and cryogenic pressure tests . 35
7.3.3.2 Pressure and temperature cycle test . 36
Table 11 — Pressure and temperature cycle test load conditions . 36
7.3.3.3 Burst test . 37
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Table 12 — Burst test load conditions . 37
7.3.3.4 Impact Load Test and Crush Load Test . 38
7.3.3.5 Creep Test . 38
7.3.3.6 Tensile and torsional axial operational load test . 39
Table 13 — Tensile and torsional axial operational load test conditions . 39
7.3.3.7 Bend radius test. 40
Table 14 Boundary conditions for the axial tests . 40
7.3.3.8 Fatigue test . 41
Table 15 — Fatigue test conditions. 41
7.3.3.9 Flow Rate Tests . 41
Table 16 — Flow test conditions . 42
7.3.3.10 Electrical properties test . 43
7.3.3.11 Leak Detection System Qualification test. 43
8 Quality assurance and control . 43
8.1 General . 43
8.2 Material selection. 43
8.3 Manufacturing . 44
8.3.1 Manufacturing basics . 44
8.3.2 Traceability . 44
8.3.3 Marking . 44
8.3.4 Packing and Preservation . 45
8.4 Factory acceptance tests . 45
8.4.1 General . 45
8.4.2 Tests to be performed on every hose assembly . 45
9 Documentation . 45
9.1 Purchasing Guidelines . 45
9.2 Design, Qualification and Manufacturing Documentation . 45
9.3 As-built documentation/Manufacturing Data Book . 46
9.4 Operation manual . 46
Annex A (informative) Purchasing guidelines table . 48
Table A.1 — General purchasing specification parameters . 48
Table A.2 — General hose parameters from manufacturer . 49
Annex B (informative) Guidelines for additional testing program . 51
B.1 Introduction . 51
B.2 Combined loads and in-service conditions to be considered . 51
B.3 Damage tolerance philosophy applied to impact and crush loads . 51
B.4 Damage tolerance philosophy for other degradation mechanisms and loads . 53
B.5 A.5 Inspectability of the hose condition . 54
B.6 Guidance on impact and crush damage during normal operation . 54
Figure B.1 — Example of ambient and cryogenic crush and impact test for testing the “mid hose”
performance. 54
Table B.1 —Hose damage testing . 55
B.7 Guidance on creep. 56
B.8 Guidance on wear . 57
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Annex C (Informative) Guidelines for Hose Qualification Categories (HQCs) Selection . 58
Table C.1 — Hose Qualification Categories . 58
Annex D (informative) Surge pressure considerations for LNG hoses . 60
Bibliography . 61
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European foreword
This document (prEN 1474-2:2019) has been prepared by Technical Committee CEN/TC 282 “Installation and
equipment for LNG”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1474-2:2008.
In comparison with the previous edition, the following technical modifications have been made:
— Update of the scope
— Review of Application and introduction of Hose Qualification Categories
— Revision of hose categories
— Review of design features
— Review of qualification requirements
— Review of Qualifty assurance and control
— Review of documentation
— Review of annexes
This series consists of 3 parts:
— EN 1474-1: Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 1: Design and testing of transfer arms
(This standard has been superseded by EN ISO 16904 - Petroleum and natural gas industries - Design and
testing of LNG marine transfer arms for conventional onshore terminals)
— EN 1474-2: Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 2: Design and testing of transfer hoses
— EN 1474-3, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 3: Offshore transfer systems
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1 Scope
This document gives general guidelines for the design, material selection, qualification, certification, and
testing details of hose assemblies for Liquefied Natural Gas (LNG) marine transfer applications.
The transfer hose assemblies are part of transfer systems (it means that they may be fitted with ERS, QCDC,
handling systems, hydraulic and electric components etc.) To avoid unnecessary repetition, cross-references
to EN ISO 16904 and EN 1474-3 are made for all compatible items, and for references, definitions and
abbreviations. Where additional references, definitions and abbreviations are required specifically for LNG
hoses, they are listed in this European Standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 1474-1:2008, Installation and equipment for liquefied natural gas — Design and testing of marine transfer
systems — Part 1: Design and testing of transfer arms
EN 1474-3:2008, Installation and equipment for liquefied natural gas - Design and testing of marine transfer
systems - Part 3: Offshore transfer systems
EN ISO 7369:2004, Pipework - Metal hoses and hose assemblies - Vocabulary (ISO 7369:2004)
EN ISO 8330:2014, Rubber and plastics hoses and hose assemblies - Vocabulary (ISO 8330:2014)
EN ISO 10619-1:2018, Rubber and plastics hoses and tubing - Measurement of flexibility and stiffness - Part 1:
Bending tests at ambient temperature (ISO 10619-1:2017)
EN ISO 16904:2016, Petroleum and natural gas industries - Design and testing of LNG marine transfer arms for
conventional onshore terminals (ISO 16904:2016)
3 Terms, definitions and abbreviations
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions given in EN ISO 7369 and EN ISO 8330 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
annular space
space between the inner fluid carrying layer and a second layer which can be used for insulation and/or safety
purposes
3.1.2
armour layer
either a braid made of wires (see braid) or strips of metal or plastic used to provide pressure strength and/or
external protection
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3.1.3
axial stiffness
extent to which a hose assembly resists tensile deformation in response to an applied axial force
3.1.4
bend stiffness
ability of a flexible pipe to resist deflection when subjected to bending loads at constant tension, pressure and
temperature
3.1.5
bend restrictor
device for limiting the bend radius by mechanical means
Note 1 to entry: A bend restrictor typically is comprised of a series of interlocking metallic or moulded rings, applied over
the outer surface
3.1.6
bending stiffener
ancillary conical shaped component, which locally supports the pipe to limit bending stresses and curvature
of the pipe to acceptance levels
Note 1 to entry: Bend stiffeners can be either attached to an end fitting or a support structure where the flexible pipe
passes through the bend stiffener
3.1.7
boil-off gas
BOG
natural evaporation from liquefied natural gas due to vaporization
3.1.8
burst test
test conducted on a hose sample until it failed by internal pressurization
3.1.9
connector
part of the end fitting used to provide a leak-tight structural connection between the end fitting and adjacent
piping
3.1.10
crush test
application of a vertical load through a beam placed laterally across the hose
3.1.11
double-envelope
layers or set of layers effecting the enclosure, and thus the isolation from the environment, of those structures,
systems and components whose failure can lead to an unacceptable release of LNG
3.1.12
D
internal bore diameter of the hose assembly
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